Started over 10 years ago is an understatement. It was supposed to be finished over 10 years ago. First the Berlin airport, now this and James Webb Space Telescope: are we really just going to finish our collective homeworks?
Also in this theme, even if material science has advanced I'm a bit curious as if it has really advanced enough that people trying to promote building molten salt breeders over and over again (that's the ones that are highly corrosive iirc? if not insert the ones with practical problems).
Reading about many of the early accidents in military and early nuclear industry, I'm not too sure that there wasn't quite a bit of "trying and failing" going on back then, and while that culture is not up to the NASA standards we see in space flights we've also seen how some of their contractors got slower and slower to the point where they lost the ability to finish things in time (and as time drags on the repeating of mistakes will come up again).
There is just too much money to be made for the corrupt people to stay away.
The honest and good offers are rarely taken, because they've realistic estimations - the dishonest one's only care about getting the contract, not finishing it... So they'll make the much better offer. And once work starts, the corruption keeps spreading. Everyone on every layer knows how unlikely their charges are going to be contested, so everyone just charges more for the same work, siphoning money from the project.
I'd consider that a cultural issue, because people at large have really started to only think about themselves and no longer identify with their work ethic. Which is understandable because the employers generally treat their employees like disposable tools.
I don't think there is any straightforward or easy solution, and it can get much much worse too. Just look at china's production issues for inland products, esp. food and consumable products.